<template>
  <div class="goods">
    <div class="wrap">
      <Crumb> </Crumb>
      <img src="../assets/img/banner.4c6b6225.png" width="100%" alt="" />
      <ul class="options">
        <li>
          <strong>排序：</strong>
          <span :class="{active: options1curr == index}" v-for="(item,index) in options1" :key="index"
            @click="options1Fn(index,item.min,item.max)">
            {{item.txt}}
          </span>
        </li>
        <li>
          <strong>分类：</strong>
          <span :class="{active:options2curr==index}" v-for="(item,index) in options2" :key="index"
            @click="options2Fn(index,item.type)">
            {{item.txt}}
          </span>
        </li>
      </ul>
      <List :arr="goodsListShow" />
      <div> {{isReachBottom?"加载完毕":"加载中...."}} </div>
    </div>
  </div>
</template>                            
<script>

import Crumb from "../components/Crumb.vue";
import List from "../components/home/List.vue";
import { GoodsSearchApi } from "@/request/api"
import { getScrollTop, getClientHeight, getScrollHeight } from "@/utlis/index"
export default {
  data() {
    return {
      goodsList: [],
      // 栏目 1精品推荐 2热门兑换 0全部
      did: 0,
      // 1实体商品 2虚拟商品 0 全部
      type: 0,
      min: 0,
      // 传0时 返回说有商品，无视其他逻辑
      max: 0,
      // 商品关键字
      keyword: '',
      // 排序的数组项
      options1: [
        { min: 0, max: 0, txt: "全部" },
        // "我还可以兑换"的max值是Header组件的coin值
        { min: 0, max: 0, txt: "我还可以兑换" },
        { min: 0, max: 500, txt: "0-500分" },
        { min: 500, max: 1000, txt: "500-1000分" },
        { min: 1000, max: 1500, txt: "1000-1500分" },
        { min: 1500, max: 2500, txt: "1500-2500分" },
        { min: 2500, max: 6500, txt: "2500-6500分" },
        { min: 6500, max: 10000, txt: "6500-10000分" },
      ],
      // 分类数组项
      options2: [
        { type: 0, txt: "全部" },
        { type: 1, txt: "实体商品" },
        { type: 2, txt: "虚拟商品" },
      ],
      options1curr: 0,
      options2curr: 0,
      goodsListShow: [],
      // 页数
      page: 1,
      // 定义显示个数
      size: 8,
      // 定义一个开关
      isLoading: false,
      // 是否到达底部
      isReachBottom: false
    };
  },
  components: {
    Crumb,
    List,
  },
  created() {
    let keyword = this.$route.query.keyword
    console.log(keyword);
    this.keyword = keyword

    this.getGoods()
  },
  mounted() {
    window.addEventListener("scroll", this.scrollFn)
  },
  beforeDestroy() {
    window.removeEventListener("scroll", this.scrollFn)
  },
  methods: {
    async getGoods() {
      let res = await GoodsSearchApi({
        did: this.did,
        type: this.type,
        min: this.min,
        max: this.max,
        keyword: this.keyword
      })
      console.log(res);
      this.goodsList = res.data

      this.goodsListShow = this.goodsList.filter((item, index) => index < 8)


      // 
      this.page = 1
      this.isReachBottom = false
      if (this.goodsListShow.length == this.goodsList.length) {
        this.isReachBottom = true
      }
    },
    options1Fn(idx, min, max) {
      this.options1curr = idx
      this.min = min
      this.max = max
      this.getGoods()
    },
    options2Fn(idx, type) {
      this.options2curr = idx
      this.type = type
      this.getGoods()
    },
    scrollFn() {
      console.log("滚动了....", getScrollTop(), getClientHeight(), getScrollHeight());

      if (getScrollTop() + getClientHeight() >= getScrollHeight() - 100) {

        if (this.goodsListShow.length == this.goodsList.length) {
          this.isReachBottom = true
          return
        }

        if (this.isLoading == false) {
          console.log("准备加载下一页", this.page, this.goodsListShow.length, this.goodsList.length);

          this.isLoading = true
          this.page++
          setTimeout(() => {
            for (let i = this.size * (this.page - 1); i < this.size * this.page; i++) {
              console.log("加载下一页", this.page, i);
              this.goodsList[i] && this.goodsListShow.push(this.goodsList[i])
            }
            this.isLoading = false
          }, 2000)

        }


      }
    }
  },
  watch: {
    "$route.query.keyword": {
      handler(newVal, oldVal) {
        console.log(newVal, oldVal);
        this.keyword = newVal
        this.getGoods()
      }
    }
  }

};
</script>
 
<style lang = "less" scoped>
@import "../less/public.less";

.goods {
  padding-bottom: 50px;
  background: #efefef;
  padding-top: 20px;

  .options {
    padding-top: 20px;
    padding-bottom: 40px;

    li {
      margin-top: 20px;

      strong {
        color: #000;
        font-weight: bold;
      }

      span {
        margin-right: 20px;
        margin-left: 10px;
        cursor: pointer;
        color: #999;

        &.active {
          color: @base-color;
          font-weight: bold;
        }
      }
    }
  }
}
</style>